42947631 has 8 divisors (see below), whose sum is σ = 63626160. Its totient is φ = 28631736.

The previous prime is 42947621. The next prime is 42947633. The reversal of 42947631 is 13674924.

It is not a de Polignac number, because 42947631 - 2⁷ = 42947503 is a prime.

It is a super-2 number, since 2×42947631² = 3688998017024322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42947633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795300 + ... + 795353.

It is an arithmetic number, because the mean of its divisors is an integer number (7953270).

Almost surely, 2^42947631 is an apocalyptic number.

42947631 is a deficient number, since it is larger than the sum of its proper divisors (20678529).

42947631 is a wasteful number, since it uses less digits than its factorization.

42947631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590662 (or 1590656 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 42947631 is about 6553.4442089637. Note that the first 3 decimals coincide. The cubic root of 42947631 is about 350.1975238798.

The spelling of 42947631 in words is "forty-two million, nine hundred forty-seven thousand, six hundred thirty-one".